Set of 2 Humbucker Pickup Mounting Rings for bridge and neck pckups,Flat Bottom Black Outside dimension: Approx. 3.58 x 1.77 inch / 91 x 45mm Inside dimension: Approx. 2.75 x 1.49 inch / 70 x 38mm Two pickup screw Holes Distance: Approx.3.11 inch / 79mm (center to center) Mounting Hole Distance: Approx. 3.26 x 1.5 inch / 84 x 38mm (center to center) Plastic /Black /Flat Bottom